There are two ways to progressively overload your body. First is to increase the number of reps you do with a set weight from the previous workout. If you performed 8 reps of bench press with 125lbs. last time, you strive to get 9 on the next workout. Second, you may progressively overload by increasing your training weight. If you got 8 reps with 125lbs. last workout and you go up to 130lbs. for 8 reps, you have progressively overloaded your body.